More than $2 million in assets have been frozen following the searches, including three properties, two boats, a trailer, bank accounts and cash.

Police allegedly uncovered about 16kg of Cannabis, 161 vials of a substance believed to be steroids, $150,000 in cash, 10 MDMA tablets and assorted items consistent with those used to sell or supply drugs.

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A 32-year-old man, 28-year-old man and a 33-year-old woman have been charged with possessing a prohibited drug with intent to sell or supply.

The 32-year-old is due to appear in the Perth Magistrates Court on Thursday, while the others have been listed for appearance on February 21.

A third man, 34, has been charged with unlawfully possessing cash and is also due to appear in the Fremantle Magistrates Court on February 21.

Operation Scarlett, which saw 26 people arrested across the country, also involved South Australian and Queensland detectives.

SA police allege the Adelaide-based leaders of the syndicate were running hydroponic cannabis grow houses, as well as acquiring cannabis from other sources.

The drugs were allegedly transported by couriers to syndicate members in Perth and Kuranda, in far north Queensland.

Detectives allege the syndicate transported up to 4082 packages of cannabis interstate in the past year and had operated since 2008.

They believe large amounts of cash were being sent back to South Australia each week, with $2 million in 26 packets returned to Adelaide in recent months.

In SA, 37 homes and businesses across Adelaide, the Barossa Valley and at Murray Bridge were searched in raids which began on Wednesday morning.

More raids were conducted on Thursday.

"Thirteen people (in South Australia) were arrested and charged using new legislation aimed at combating serious and organised crime," assistant commissioner Paul Dickson said.

"This group have been charged with participating in a criminal organisation, aggravated trafficking of a large commercial amount of cannabis for the benefit of a criminal organisation and money laundering."

A further three people in SA were charged with cultivating cannabis.

Six homes were searched in Queensland and six people were charged with a range of offences including trafficking cannabis and possession of the proceeds of crime.